12267772638 has 32 divisors (see below), whose sum is σ = 27066804480. Its totient is φ = 3675735360.

The previous prime is 12267772613. The next prime is 12267772669. The reversal of 12267772638 is 83627776221.

It is a super-2 number, since 2×12267772638² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1038370 + ... + 1050117.

It is an arithmetic number, because the mean of its divisors is an integer number (845837640).

Almost surely, 2^12267772638 is an apocalyptic number.

12267772638 is an abundant number, since it is smaller than the sum of its proper divisors (14799031842).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12267772638 is a wasteful number, since it uses less digits than its factorization.

12267772638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2088592.

The product of its digits is 2370816, while the sum is 51.

The spelling of 12267772638 in words is "twelve billion, two hundred sixty-seven million, seven hundred seventy-two thousand, six hundred thirty-eight".